Force between Magnet and Electromagnetexamples|products|Murata Software Co., Ltd.

Example7 Force between Magnet and Electromagnet

General

  • In this exercise, a magnet is placed near the electromagnet used in the Exercise 6.
     

  • The electromagnetic force, the current density, and the vectors of magnetic field and the magnetic flux density are solved.
     

  • This exercise can be solved by axisymmetric analysis as well. See Exercise 25.
    The number of meshes is much less with axisymmetric models, so the simulation time is shorter.
     

  • Unless specified in the list below, the default conditions will be applied.
     

 

Analysis Space

Item

Settings

Analysis Space

3D

Model unit

mm

Analysis Conditions

Item

Settings

Solver

Magnetic Field Analysis [Gauss]

Analysis Type

Static analysis

Options

N/A

 

 

Model

A cylindrical magnet is placed on top of the magnetic core of the electromagnet used in the Exercise 6.

 

Mesh size is set at 1[mm] as the magnetic field changes drastically between the magnets.

 

  • Set the gap between the bodies and mesh size properly to obtain valid calculation results.
    See [Calculation of the Electromagnetic Force] for more details.

 

Body Attributes and Materials

Body Number/Type

Body Attribute Name

Material Name

0/Solid

Core

Core

4/Solid

Coil

008_Cu *

3/Solid

Mag

Mag

* Available from the Material DB

 

The material properties are set up as follows:

Material Name

Tab

Properties

Mag

Permeability

Material Type: Permanent Magnet

Magnet

Magnetization Strength: 0.5

Core

Permeability

Relative Permeability 5×10^3

 

Body attribute is set up as follows to apply current to the loop coil.

Body Attribute Name

Tab

Settings

Coil

Current

Waveform: Constant

Current: 1[A]

Turns: 100[Turns]

Direction: Loop Coil/Magnetic Field Direction:

Magnetic Field Vector: X=0, Y=0, Z=1

Boundary Conditions

No setting.

Results

To see the electromagnetic force, go to the [Results] tab

 

 

 and click [Table] .

 

 

Two magnets are pulling each other with the approximate force of 1.2[N] in the Z direction.

 

 

Shown below are the vectors of the current density flowing through the loop coil.

 

The vectors of the magnetic field are shown below.

 

 

The vectors of the magnetic flux density are shown below.